Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec3f24897d8cbb8…

MALICIOUS

PDF

79.3 KB Created: 2021-02-18 13:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a97e9ec9d90c24973b262e9c52bd6b01 SHA-1: fd759fe3c380aaf251d964b2b4dca260c13224fe SHA-256: fec3f24897d8cbb833a4812b13ad9ca09b46929ab036c232d678d4a19f91c80a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for requesting recovery secrets or private keys, indicating a phishing attempt. It also links to a known malicious redirector URL. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=object+oriented+programming+java+tutorial+point In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5fec23c09fb17.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/8c3d23b.pdfIn PDF document text
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/7699291.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/gufevimoligum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5fed7a569c73e.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jXUjjhg/black_and_red_ombre_coffin_nails.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_5ff3a1be7b720.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/subufawerel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5ff6729915c18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5ffea3f4ba2ff.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jdHgeWT/89968653911.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/pRtDiaV/sukidavenelirelos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/fejegi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/grievance_policy_template_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/transfer_iphone_contacts_to_android_using_icloud.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/36843184321.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 5516 bytes
SHA-256: 4ded2af98c3e43e1dfd39b8b4405ed3feb75ee348048abb0118ebff658762199
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 11456 bytes
SHA-256: af26b7f940527f7263d439c1937fca6a7ba91984c044cca99dc47be0ec34de1a

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